3D printed multi-color sign generator

Turn a PNG or JPG into a multicolor sign you can print with one nozzle. You'll get STL and 3MF models, a preview, and the exact layers where you need to swap filament.

No account needed. Your image is cleared once the result is saved, and your download stays available for 1 hour after it's generated.

A finished red, white, and black caution sign reading “Caution: projects may take longer than YouTube suggested” on a Prusa CORE One print bed

Start with your artwork

Logos and high-contrast drawings with solid areas of color produce the cleanest layers.

Artwork

PNG or JPG, up to 5 MB.

Preview

Choose an image to see the color-reduced preview. It updates automatically as you change the settings and stays in this browser.

This uploads the image and generates the 1,400-pixel preview, STL, 3MF, and instructions. The 3MF includes M600 color-change points for PrusaSlicer. It can take a couple of minutes.

Colors

Each color gets its own height in the model and its own filament in the finished print.

Maximum colors

Color reduction method

Background color

Fills transparent pixels and helps Automatic choose the bottom color.

Layer order

Manual color order

Used only with Manual. Enter hex colors from the bottom layer up, separated by commas.

Minimum color share

Smoothing radius

0 keeps every stray pixel. Higher values remove more speckles.

K-means seed

Try another whole number to get a different K-means color grouping.

Size and detail

Set the width or height, or use both as a bounding box. The artwork keeps its aspect ratio.

Artwork width (inches)

Artwork height (inches, optional)

Border (inches)

Cells per inch

More cells preserve finer detail and make a larger STL. The shared-server limit checks both image detail and mesh complexity.

Round background corners

Rounds the outside corners of the background plate.

Background corner radius (mm)

Used when rounded corners are on.

Background corner radius is unavailable while rounded corners are off.

Printer settings

Match the layer height you plan to use in your slicer so every swap lands on a real layer.

Layer height (mm)

First layer height (mm, optional)

Leave blank to use the regular layer height.

Base thickness (mm)

Layers per added color

Enter 1 number to use for every added color, or list the added colors from bottom to top, such as 3, 3, 5.

Nozzle diameter (mm)

This is recorded in the instructions for reference.

Mirror the artwork horizontally

Reverses the artwork from left to right in the STL and preview.

Download options

The generated PNG preview is 1400px on its longest side.

Include the color and layer legend

The printing tutorial covers slicer setup and filament changes, along with a few things to check before you print.